avutil/internal: Remove unused ff_rint64_clip()

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavutil/internal.h

@@ -217,42 +217,6 @@ void avpriv_request_sample(void *avc,
 #define SUINT32 uint32_t
 #endif
 
-/**
- * Clip and convert a double value into the long long amin-amax range.
- * This function is needed because conversion of floating point to integers when
- * it does not fit in the integer's representation does not necessarily saturate
- * correctly (usually converted to a cvttsd2si on x86) which saturates numbers
- * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
- * behavior, allowing this sort of mathematically bogus conversions. This provides
- * a safe alternative that is slower obviously but assures safety and better
- * mathematical behavior.
- * @param a value to clip
- * @param amin minimum value of the clip range
- * @param amax maximum value of the clip range
- * @return clipped value
- */
-static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
-{
-    int64_t res;
-#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
-    if (amin > amax) abort();
-#endif
-    // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
-    // do range checks first
-    if (a >=  9223372036854775808.0)
-        return amax;
-    if (a <= -9223372036854775808.0)
-        return amin;
-
-    // safe to call llrint and clip accordingly
-    res = llrint(a);
-    if (res > amax)
-        return amax;
-    if (res < amin)
-        return amin;
-    return res;
-}
-
 /**
  * A wrapper for open() setting O_CLOEXEC.
  */